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Genomic Characterization of the Italian Wolf (Canis Lupus )

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Genomic Characterization of the Italian Wolf (Canis Lupus ) Alma Mater Studiorum - University of Bologna DOCTOR OF PHILOSOPHY Biodiversity and Evolution Genomic characterization of the Italian wolf (Canis lupus): the genes involved in black coat colour determination and application of microarray technique for SNPs detection. Candidate: Dott. CLAUDIA GRECO PhD Coordinator: PhD Advisor: Prof. GIOVANNI CRISTOFOLINI Prof. ETTORE RANDI CYCLE XXI 2009 Alma Mater Studiorum - Università di Bologna Istituto Superiore per la Protezione e la Ricerca Ambientale DOTTORATO DI RICERCA Biodiversità ed Evoluzione Ciclo XXI Settore scientifico disciplinare di afferenza: BIO/05 ZOOLOGIA Genomic characterization of the Italian wolf (Canis lupus): the genes involved in black coat colour determination and application of microarray technique for SNPs detection. Presentata da: Dott. CLAUDIA GRECO Coordinatore Dottorato: Relatore: Prof. GIOVANNI CRISTOFOLINI Prof. ETTORE RANDI Esame finale 18.05.2009 TABLE OF CONTENTS I – ABSTRACT AND KEYWORDS ........................................................................... Pag. I II – INTRODUCTION ................................................................................................. “ II 1 – BACKGROUND .................................................................................................... “ 1 1.1 STATUS OF KNOWLEDGE ON WOLF AND DOG .................................... “ 1 1.1.1 Wolf ........................................................................................................ “ 1 1.1.2 Historical and current wolf distribution ................................................ “ 1 1.1.3 Populations status in Europe ................................................................. “ 2 1.1.4 Conservation status and legal protection ............................................... “ 8 1.1.5 Peculiarity and characteristics of the Italian wolf .................................. “ 9 1.1.6 The debated domestication .................................................................... “ 10 1.1.7 How does domestication proceed ........................................................... “ 13 1.1.8 Dog genetics .......................................................................................... “ 14 1.1.9 Canine coat colour genetics .................................................................. “ 16 1.1.10 The occurrence of black wolves .......................................................... “ 18 1.1.11 Two possible explanations for melanism ............................................. “ 19 1.2 FUNDAMENTALS OF DEOXIRIBONUCLEIC ACID (DNA) VARIABILITY ....... “ 20 1.2.1 DNA structure and function .................................................................. “ 20 1.2.2 Genetic mutations, polymorphisms and genetic markers ....................... “ 21 1.2.3 Single Nucleotide Polymorphisms ......................................................... “ 22 2 – AIMS ....................................................................................................................... “ 24 3 – MATERIALS AND METHODS ........................................................................... “ 25 3.1 Sampling ............................................................................................................ “ 25 3.2 DNA extraction .................................................................................................. “ 27 3.3 DNA amplification ............................................................................................. “ 29 3.3.1 Amplification and sequencing of Mc1r and Agouti genes ...................... “ 29 3.3.2 Analysis of the K locus ........................................................................... “ 30 3.4. Microarray analysis .......................................................................................... “ 32 3.5 Genetic variability analysis ................................................................................ “ 38 4 – RESULTS ............................................................................................................... “ 40 4.1 The melanism in Italian wolves .......................................................................... “ 40 4.1.1 Agouti and Melanocortin receptor 1 ...................................................... “ 40 4.1.2 The K locus mutation ............................................................................. “ 41 4.2 Characteristics of the black phenotype .............................................................. “ 49 4.3 Canine DNA microchip results .......................................................................... “ 53 5 – DISCUSSION ......................................................................................................... “ 60 5.1 The K locus allows to identify black wolves ....................................................... “ 60 5.2 Genetic diversity in Italian VS European wolf populations ............................... “ 63 6 – CONCLUSIONS AND PERSPECTIVES ............................................................. “ 66 AKNOWLEDGEMENTS ............................................................................................ “ 68 REFERENCES ............................................................................................................. “ 69 I - ABSTRACT This study provides a comprehensive genetic overview on the endangered Italian wolf population. In particular, it concentrates on two research lines. On one hand, we focused on melanism in Italian wolves in order to isolate a mutation related with black coat colour in canids. With several reported black individuals (an exception at European level), the Italian wolf population constituted a challenging research field posing many unanswered questions. As found in North American wolf, we reported that melanism in the Italian population is caused by a recently discovered melanocortin pathway component, the K locus, in which a beta- defensin protein acts as an alternative ligand for the Mc1r. This research project was conducted in collaboration with Prof. Gregory Barsh, Department of Genetics and Paediatrics, Stanford University. On the other hand, by means of a customized Canine microarray we performed analysis on a significant number of SNPs (Single Nucleotide Polymorphisms) useful to integrate or substitute existing microsatellite markers for individual genotyping and wolf-dog hybrids identification. Thanks to DNA microchip technology, we obtained an impressive amount of genetic data which provides a solid base for future functional genomic studies. This study was undertaken in collaboration with Prof. Robert K. Wayne, Department of Ecology and Evolutionary Biology, University of California, Los Angeles (UCLA). I spent a three-months period at UCLA as visiting student supported by a Marco Polo grant, in order to process the Italian samples. KEYWORDS : melanism, black phenotype, coat colour, K locus, SNPs, microarray, Italian wolf. I II - INTRODUCTION The increased amount of black or nearly black pigmentation ( melanism ) is a common characteristic in mammals. Melanism occurs frequently in wolf phenotype but it is not equally widespread within all the diverse populations across the world. In North America, dark wolves’ frequency is quite consistent, reaching almost 50% in some areas, such as Yellowstone National Park. On the contrary, melanism is extremely rare or absent in the majority of the European populations. Melanistic individuals have been occasionally reported in the Italian wolf population. With no proved evidence of black wolves’ existence before 1982, melanism is not considered a typical characteristic of the Italian wolf phenotype. Nevertheless over the last twenty years, black wolves have been detected in the Apennines near Arezzo and, more recently, in other areas of the Tuscan-Emilian Apennines. Moreover, dark individuals sighting and carcasses discoveries are increasing all over the Northern Apennines. One explanation to the black coat occurrence in Italy relies on the hypothesis of a mutation fixation in a local population - plausibly in the Romagna Apennines -, which may have expanded northward along the Apennines. Another hypothesis suggests that melanism in Italian wolf depends on hybridization with a black domestic dog. Nonetheless, there is no genetic evidence of dog introgression in the Italian wolf population supporting this theory and only few hybridisation events were described. It follows that the dog gene introgression - if it ever happened - did not occurred recently. In order to find the solution to such a dilemma, the detection of the DNA mutations which causes melanism is the only practical way to comprehend the origin of melanistic phenomenon. The second research line focuses on the identification thanks to the microarray technique of thousands of single nucleotides polymorphisms characterizing the Italian wolf population. II Italian wolf population is an ecotype of the European wolf from which remained separated for around 150 - 200 years. Because of its long-lasting historical isolation and peculiar morphological characteristics, the Italian wolf represents an extremely interesting case study. Furthermore, the Italian population is characterized by a reduced genetic variability and the fixation of a single mitochondrial haplotype. The genetic characterization so far utilized bases on eighteen diagnostic microsatellites loci which identify species, individuals, sex, and kinship. A previous study characterized around only fifty SNPs within the population. In our research we were
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